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Variable Hawk

Geranoaetus polyosoma
(Quoy, JRC; Gaimard, JP, 1824)
Aguilucho Común
Gavião-de-costas-vermelhas

Family: Accipitridae
Order: Accipitriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Records from Faro Belen

Conservation status according to BirdLife International: Least Concern

Other common names: Ñanco, Aguilucho Variable.

Synonyms: Buteo polyosoma, Falco polyosoma.

Subspecies:


Description: It is a large, long-winged raptor with a slender profile and remarkable plumage variability. Individuals range from mostly ash-gray to rufous or chestnut tones, with lighter or darker underparts depending on morph. In flight, it is recognized by its slightly raised wings forming a shallow “V”, relatively short tail, and pale patches at the base of the primaries. Juveniles tend to be browner and more streaked.

Geographic distribution: It is widely distributed across South America, from southern Colombia and Venezuela to southernmost Chile and Argentina. It is especially common along the Andes, but also inhabits Patagonian steppes, intermontane valleys, and open lowlands.

Habitat: It occupies open and semi-open habitats, including grasslands, shrublands, agricultural areas, and mountainous regions. It tolerates a broad altitudinal range, from sea level to over 4,000 m, efficiently using thermal currents for soaring.

Diet: It is an opportunistic predator, feeding mainly on small mammals (particularly rodents), medium-sized birds, reptiles, and large insects. It also scavenges when opportunities arise, which increases its dietary flexibility.

Behavior: Usually seen alone or in pairs, though it may gather where food is abundant. It spends long periods soaring with a powerful yet economical flight, and maintains large territories during the breeding season.

Nesting: It builds large stick nests, typically on rocky cliffs, escarpments, or occasionally tall trees and human-made structures. Clutches usually consist of one to two eggs, with shared parental care and an extended fledging period.

Conservation status: It is classified as Least Concern globally due to its wide range and generally stable populations, although local threats include persecution, electrocution, and habitat alteration.


Author of this compilation: EcoRegistros – 15/12/2025




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Last published photographs

Foto
Photography ID: 574519
  Immature

Faro Belen
Río Negro
Argentina
03/07/2024
Ricardo Juliano
Foto
Photography ID: 517498
♂ ♀
  Adult

Faro Belen
Río Negro
Argentina
12/10/2022
Hernán Tolosa
Foto
Photography ID: 506489
  Adult

Faro Belen
Río Negro
Argentina
09/04/2022
Ricardo Juliano
Foto
Photography ID: 502605
  Adult

Faro Belen
Río Negro
Argentina
07/30/2022
Ricardo Juliano
Foto
Photography ID: 463118
  Adult

Faro Belen
Río Negro
Argentina
09/23/2021
Ricardo Juliano



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 Reports


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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
225079423/02/2025ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
200762107/03/2024ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
194860414/01/2024ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
179399718/07/2023ArgentinaRío NegroFaro Belen1Ricardo Juliano
170099002/01/2023ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
168722410/12/2022ArgentinaRío NegroFaro BelenHernán Tolosa
163557304/09/2022ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
161845530/07/2022ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
158020310/05/2022ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
146547923/09/2021ArgentinaRío NegroFaro Belen, Faro BelenRicardo Juliano
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 15/03/2026.